Scissors-grinding machine



S. 0. HEINDL.v

SCISSORS GRINDING MACHINE.

APPLICATION man sEPT. 24, 1921.

1 427 7 3 5 4 Patented Aug. 29, 1922.

'8. 0. HEINDL.

SCISSORS GRINDING MACHINE. v APPLICATION FILED sEPT.24.1921.

2 SHEETS-SHEET 2.

` lillt L w L ma BIJ STEPHEN O. HEINDL, OIE CHICAGO, ILLINOIS, ASSIGNDR OIF ONE-HALE' T0 ERNEST ZEETZ, OF CHICAGO, ELLNOS. i

SCISSOBS-GBINDNG MACEINE.

Mamas.

Application led September 24, 1921.

Chicago, in the county of Cook and State of illinois, have invented certain new and useful lmprovements in Scissors-Grinding rlifachines, of which the following is a specification.

rlhe invention relates to a machine for grinding scissors and the like, the aim being to enable an unskilled operator to sharpen the scissors effectively with a minimum expenditure of time and effort.

lith this aim in view, the primary object of the invention is to provide a machine which substantially automatic in operation, it being onlynecessary to adjust the scissors blade to the grinding wheel and apply power to the driven element.

A further object of the invention is to provide improved means for releasing the carriage upon which the scissors are clamped, from the feeding mechanism.

Still another object of the invention is to provide an improved'means for supporting the scissors to be ground which is capable of adjustment to vary the angle at which the blade is held to the grinding wheel, whereby to enable the operator to obtain any desired bevel on the cutting edge.

A general objectv of the invention is to provide a machine of an exceedingly practical character, which may be manufactured at a relatively low cost, which is durable, and which presents a neat appearance.

rlhe objects ofy the invention thus set forth, together with other and ancillary advantages, are obtained by the construction and arrangement illustrated inthe aceompanying drawings forming part hereof, but it is contemplatedthat various changes in form, construction and arrangement may be made by those skilledv inthe art without depart-.ing from the` spirit and scope of the invention as expressed in the appended claims.

in Figure 1 of the drawings 1 have illustrated my improved machine, the figure being a central, vertical sectional view. Fig. 2 is a plan view of the machine. Fig. 3 is a vertical sectional view through the work clamp.' `liig. 4 is a fragmentary, vertical, sectional view taken in the plane of line Serial No. 503,029.

4f1 of F ig. 2 and illustrating the carriage releasing means. Fig. 5 is a sectional view7 taken on the line 5 5 of Fig, 1.

The machine comprises a base or frame i having mounted therein a horizontal shaft Specicaton of Letters Patent. Patented Aug. 29, 1922.

8 constituting a combined feed screw and operating shaft. 9 designates generally the carriage which is operatively connected with the feed screw and slides upontwo longitudinal rods `10. 11 indicates the work clamp'mounted upon the carriage, and 12 the grinding wheel operatively connected with-the shaft 8 and mounted for rotation on an axis above and parallel to the shaft Swith its periphery disposed in t-he path of movement of the scissors `secured in the work clamp y11.

The frame 7 comprises a base plate 13 i' having at its opposite ends a pair of uprights or standards 141 and 15. These standards are preferably formedintegral with the base plate and they are respectively providedwith journal bearings 16 and 17 for the opposite ends of the shaft 8. The forward end of the shaft projects through its bearing 16 and has secured thereon a relatively heavy hand wheel 18. l? or supporting the rods '10, the standard 14 has secured thereto'.l as `by means of a bolt 19, a V-shaped bracket 14%L having a pair of upwardly extending arms disposed upon opposite sides of the journal bearing 16. The forward ends of the rods 10 are mounted in these arms, and the opposite ends of the rods are entered in suitable apertures in the standard 15.

The carriage 9 comprises a lower or base portion in the form of a yoke 2O having formed at its oppositeends sleeves 21 and 21L slidably mounted upon the rods 10. Rising from the central portion of the yoke` is a stem'QQ carrying a transverse vbearing 23 for a supporting rod 211 of the work support- The bearing 23 is provided with a thumb screw 25 projecting forwardly from the bearing and adapted to clamp the rod in any desired position of lateral adjustment.

The carriage 9 has an operative connection with the shaft 8, in the form of a segend in a socket 30 provided in the under side of the yoke 26 and bears at its other end upon the upper surface of the segmental nut 26. The spring thus acts to maintain the nut normally in engagement with the shaft 8. The lever 27 projects radially outwardly from the sleeve 2l, to form a thumb piece 3l whereby the nut 26 may bc swung against the action of the spring 23 out of engagement with thc screw shaft 8. By this means the carriage may be disassociated from the shaft and slid longitudinally of the machine as may be desired.

l The spring' 29 is preferably made of substantial strength so as to maintain effectively the nut 26 in engagement with the shaft 8. ln order therefore to facilitate the operation of sliding the carriage free of the shaft, Vl provide a spring-actuated detent, shown particularly in Fig. 4. This device comprises a vplunger 32 slidable within a bore 33 provided in a downward extension 34 of the sleeve 2l. A coiled expansion spring 35 encircles the `plunger 32 and acts between a bushing 36 closing the outer end of the bore and a collar 37 fixed on the plunger. The inner or rear end of the plunger normally engages with the forward face of a dependent portion 38 of the lever 27 and when the lever' is swung to carry the segment 26 out of engagement with the shaft 8, the plunger is forced by the spring 35 into a socket 39 in the forward face of the depending portion 38, said socket being arranged so as to be in direct alinement with the plunger when the segment 26 is in its inoperative position. By this means, it will be apparent7 the lever may be yieldably locked in position to hold the segmental nut disassociated from the screw shaft 8.

The work-clamp supporting means comprises a bearing 40 formed rigid with the rod '24, which it will be remembered is adjustably mounted in the bearing 23 upon the carriage.\ A rod or stem 4l carrying a head 42 is entered through the bearine' 40, and a thumb screw 43 screw threaded upon the free end of the stem 4l is adapted to clamp the head in any desired position of adjustmenton an axis parallel to the axis of the grinding wheel. The head 42 is bored vertically thereof to receive the stem 44 of the clamp in which the scissors to be ground are secured.

This clamp comprises a lower or stationary jaw 45 fixed upon the stem 44 and an upper jaw 46 slidable on the stem. Said upper jaw is normally held spaced from the lower jaw by means of a coiled expansionV spring 47, but is held against relative rotary movement by a pin 48 rigid therewith and Vengaging in an aperture 49 formed in the .lower jaw. The latter is secured to the stem 44 :by meansfofa` pin 50. To reeeiveA` the .lower end of "the l :spring 47 7 the lower jaw is provided with a socket 5l in its upper surface, of a size adapted to completely house the spring when the jaws are clamped together. A thumb-screw 52 upon the upper end of the stein 44 is provided for this purpose. 53 designates a socket in the adjacent faces of each of the aws 45 and 46 for receiving the head and nut of the connecting bolt for the blades of the scissors. Preferably the faces of the jaws are cut away at the forward edges of the sockets as at 54 to receive the head and nut of said connecting bolt.

ln or ler that the blade of the scissors being ground shall be held automatically to the grinding wheel, l provide means comprising col-cd torsion spring 55 entered within a socket 56 in a sleeve 57 secured upon the lower end of the stem 44, which latter projects a short distance below the bearing 42. The sleeve is secured in position upon the stein by means of a screw The spring is thus arranged to encircle the lower end of the stem, and lower end 59 is inserted into a hole at the bottom' of the socket 56 and its upper end 60 entered into a hole drilled in the lower end of the bearing 42. rllhe arrangement is such that the spring 55 tends to rotate the stem 44 and hence the work clamp in a direction to carry the blade being ground toward the grinding wheel. llreferably means is provided to limit the rotation of the work clamp under the action of the spring 55.. rl`his means herein comprises a pin 6l projecting radially from the stein 44 and engaging' with a shoulder 62 formed by cutting away a portion of the upper end of the bearing 42.

The fg'rinding wheel l2 l) is mounted nea "l l les the upper end of the standard l5 upon stud 63./ the standard being provided with a forwardly projecting journal bearing 64. This standard it will be observed is made hollow to form a chamber 65 for enclosing the gearing constituting the connection between the grinding wheel shaft and the driven shaft 8. rl`he rear wall of this chamber is formed by a plate 66 de tachably secured to the standard as by means of screws 67. This plate is provided near its upper end with a journal bearing 68 having a bushing 69 of suitable metal in which the rear end of the wheel shaft 63 operates; and near its center has a forwardly projecting stud 66CL against which the rear end of the shaft 8 is adapted to abut. A nut 70 is provided on the rear end of the shaft 63; and preferably a fiber washer 7l is interposed between the nut and the rear face of the journal bearing68. A stopscrew 72 is entered through the nut so as to engage the rear end of the shaft 63. By this means it will be apparent the parts may be nicely adjusted so' as to operate smoothly and 'noiselessly Fixed upon the grinding wheel shaft 63 is a pinion 7 3 meshing with a spur gear 74 tast upon the rear end of the main shaft 8. rlhe rotation ot said shaft through the application of power to the hand wheel 18 thus effects a rotation of the grinding wheel through gearing 74, 73, and the feeding ot positioned at the d esired degree of angularity with reference to the surface of the grinding wheel and at the proper distance from the grinding wheel so that the spring 55 exerts a slight pressure of the blade upon the grinding-wheel. The carriage is now positioned so that the rear ends of the sleeves 2l and 2l engage with the collars 75l fixed upon the rods l0, these collars having been set so that the rear end of the cutting edge ot the blade is positioned adjacent the torward edge ot the grinding wheel.

Power is now applied to the shaft 8 through the operation ot the hand wheel 18, the wheel being turned in a clockwise direction. The grinding wheel is thus caused to rotate in the opposite direction away from the cutting edge of the blade, and simultaneously the carriage is ted torwardlyr by the action ot the screw threads engaging the segment 26 of the carriage.

It one operation or stroke of the blade across the grinding wheel is not suflieient, the carriage is returned to its rearmost position for another operation. rIhis is accomplished by depressing the thumb piece 3l oit the lever 27 until the detent 32 engages in the socket 39 in the depending portion 3S of said lever. The segmental nut 26 is new held out et operative engagement with the screw shaft 8 and the carriage is free to slide upon the rods l0 independently of the shaft S; Such release or' the carriage is advantageous in that it enables the operator to return the carriage to its initial position quickly and with a minimum expenditure of effort; and the means for locking the segmental nut in its inoperative position insures that it will not be permitted to engage with the shaft in its sliding movement. Preferably this nut is. formed of brass or similanmaterial and since the spring 29 is necessarily made of substantial strength, in order to hold the nut in its operative position, the positive locking ot the nut in its raised position insures that a careless operator will not be able to allow the nut to engage in the threads, in the sliding movement of the carriage, to the injury of the threads of the nut.

It will be seen that I have provided a machine which is substantially automatic in operation, it being only necessary to initially adjust the work and apply power to the driven shatt. y The work is firmly held in its clamp, and maintained yieldingly in contact with the grinding wheel. A bevel of any desired degree may be secured by a simple adjustment 'oi' the clamp` support, and the work itself may be readily 'fastened in the clamp, adjusted with reference thereto, and

removed therefrom. Furthermore,the construction provided is exceedingly practical, being relatively simple so that it maybe manufactured at a low cost.

lI claim as my invention:

work clamp mounted on said carriage com? prising an oscillatory stem, a pair of jaws held against rotation on said stem, and spring means acting upon said stem to rotate it in a direction to carry the work toward the periphery of the grinding wheel.

2. In a grindingmachine, the combination with a grinding wheel, ot means for supporting the work for the grinding operation comprisinga stationary head, a stem mounted to rotate in said head, means carried by said stem tor clamping the work,vand means acting` between the stem and said head for F) work to the wheel. j

3. In a grinding machine, the combination with a grinding wheel, of means `for supporting the work for the grinding operation comprising a stationary head, a stem mounted to rotate in said head, means carried by said stem for clamping the work, means acting between the stem and said head for rotating the stem in a direction to hold the work yieldingly to the wheel, and means for limiting the rotation of the stem by the last mentioned means.

4. In a grinding machine, a work supporting means comprising, in combination, a laterally adjust-able rod, a bearing on the end of said rod, ahead havinga stein entered through said bearing so as to be adjustably secured therein, and a work clamp having a stein mounted in said head in perpendicular relation to the irst mentioned stem.

5. In a grinding machine of the class described, the combination of a grinding wheel, a carriage movable in a direction parallel to the axis of said wheel, and work supporting means on said carriage comprising a stem, means on said carriage for sup- Yrotatin@` the stem in a direction to hold the l. In a grinding machine, the combination iso porting said stem for adjustment on a horizontal axis, and a clamp carried by said stem.

6. ln a grinding machine7 the combination with a rotatable grinding wheel, a carriage` mounted 'for movement in a direction parallel to the of said wheel, and workholding means mounted for rotative adjustment on an axis also parallel to the axis of said grinding wheel.v y

7. ln a grinding machine, the combination with a rotatable grinding wheel, a carriage ymounted for movement in a direction y parallel to the axis of said wheel, and workholding means mounted for rotative adjustment on an airis also parallel to the axis of said grinding wheel and for lateral adjust- ,inent transversely of said axle.

y S. ln a grindingvma-ehine, the combination with a rotatable grinding wheel of a carriage movable in a direction parallel to the axis of said wheel, means adjustable transversely of said aXis tor supporting the work, `a work clamp carried by the lastmentioned means rotatable upon an upright axis, and spring means for rotating said clamp on its axis whereby to carry the work against the .grinding wheel.

9. In a grinding machine,fthe combination with a rotatable `grinding ywheel of a earriage movable in a direction parallel to the .axis of said wheel, means for supporting the work adjustable on an axis also parallel to the axis of the'wheel, work clamp carriedby the last mentioned means rotatable upon an upright axis, and spring` means 'for rotating said clamp on its axis whereby to carry the work against the grinding wheel.

l0. In a grinding machine, the combination with a rotatable Agrinding wheel of a carriage movable in a direction parallel to the axis of said wheel, means Yfor supporting the work adjustable transversely oli' said axis and also on an axis parallel to the axis of the wheel/.a work clamp carried by the last mentioned means rotatable upon an upright axis, and spring means for rotating -detent-when the nut is in its inoperative position. l

l2. In a grinding machine, the combination of a fra-me, a standard at each end of the trame, a carriage, a feed screw for said carriage mounted lat its opposite ends in said'standards, a V-braclret carried by one Of the standards having its upper ends disposed upon opposite sides of the standard, and a pair of slide rods mounted at one end inthe upper ends of said bracket and at their opposite ends in the other one of said standards.

`ln testimony whereof, I have hereunto set my hand.

srnrnnn o. Hamon 

